We have just completed our lithium upgrade with all equipment reading the same voltage, Multiplus, 3 x mppt's and the BMV700, but the VE.Bus smart dongle is reading 0.35volts lower than everything else, we are connected in parallel with 3 x 240ah lithium batteries via busbars. I wanted to use the dongle which is placed on top of one of the batteries to read the temp which made the power cables from dongle too short. I spoke to a Victron installer who advised that the 12v connection to the Smart dongle can be connected to the pos & neg busbars for 12v power as its only to power it up so the question is connected to the busbars ok or do they have to be connected directly to the battery? All connection's have re-checked, I've read other post of reading high but not lower, can anyone shed some light on this please.
